Hello,

I am going to install a ceiling for soundproofing under an existing concrete ceiling. It is a relatively large area, 4 by 8 meters.

The concrete ceiling is constructed with lightweight concrete beams (see image).

My idea is to attach battens 28x70mm at CC60, and nail 80mm plug nails at CC30 into the beams.

My question is:
  • Do you think it is feasible to do it this way, with plug nails into these lightweight concrete beams?

Regards,
Daniel
 
  • Lightweight concrete beams and wooden frame under existing concrete ceiling, showing construction details for soundproofing installation.
Is the lightweight concrete ceiling completely flat?

You can attach battens at cc-300 to the ceiling; spike plugs might work, but often it's just as effective to simply screw into lightweight concrete. You need to be careful because if you overtighten and it starts to slip, the screw hole is done for, and you'll have to make a new one slightly to the side. As usual with a lightweight concrete floor structure, there's bottom reinforcement that you should avoid hitting.
 
Thank you anthill for the answer!

I would be surprised if it's completely flat, there's a layer of plaster which I had planned to leave as is. It felt extremely tedious to remove everything. Is there a smart way to adjust the joists to level it, just by shimming underneath something?

Regarding the bottom reinforcement, I assume you simply have to drill a new hole if you encounter it?
 
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